Micrometer expansion gauge



Jah. 17, 192s.

G. A, ElsELE uIcRouETER EXPANSION GAUGE Filed Jan. 26. 1927 mef- A U Patented Jan. 17, 1928.'

UNITED STATES GUSTA'V A. EISELE, 0F BELLMAWR, NEWJ'EBS'EY.

MICBOMETER EXPANSION' GAUGE.

Application ledanuary 26, 19 27 Serial No. 163,715.

This invention relates to new and useful improvements in gauges, and has :for lts prlmary object to provlde a tool which has been designed to ta e measurements of holes of small diameter ranging from one-half inch and under.

It is believed that there is no tool now 1n existence for measurin holes of small diameters which is as ofg simple construction as the presentv invention, or that. has the range of usefulness as well as formlng practically a solid auge or measurement that will not give, sip or spring when 1n use, by pressure upon the same.

In the drawing wherein like reference characters indicate corresponding parts throughout the several views:

Figure 1 is an elevation of a micrometer expansion gauge constructed in accordance with the present invention.

Figure 2 is a detail longitudinal sectlon thereof. Figure 3 is a front end elevatlonand Figure 4 is a section taken substantially upon the line 4 4 of Figure 2.

Now having particular reference tothe drawing my novel tool consists of a. solid bar 5 of high grade tool steel, a predetermined area of which is milled so as to rovide a handle 6. The bar 5 is provided with a longitudinal bore 5. From this milled portion 6 to the front end of the tool,

said bar 5 is longitudinally slotted as at 7-7, while the en s of the bar at opposite sides of the slot are formed or provided with semi-spherical shaped heads 8-8 for disposition within the hole beingl measured. The opposed faces of these semi-spherical heads are formed with tapered channels for receiving a circular tapered expansion head 9 that is threaded upon the adjacent threaded end of an elongated rod 10, that extends rearwardly through thebore 5 of the bar 5 and'that is connected at its op osite end to a reducedneck portion 11 o? a milled turning handle 12,-which neck ortion is rotatable within the socketed en 13 of said bar 5, as shown in Figure 2. Within the socket of the bar, said neck is formed with a circumferential channel 15 within which is arranged a split collar 16 for the purpose of retaining the handle in proper position with res ect to the bar 5.

The neck 11 o said handle at the edge of the socketed end of the bar 5 is provided ,turning o v19 for engagement between the heads 8-8' with micrometric indicating characters 17 cooperating with a zero oint 18 on the end of the bar 5 so that the egree of ex ansion of the gauge heads 8 8 may be rea ily determined.

The ex anding head 9 operable by the `the rod 10 is formed with a pin to prevent the turnin of the expansion head upon said rod am? obviousl when the handle 1.2 is turned` in one .direction the wedge 9 will be drawn rearwardly for causing the heads 8-8 to move outwardly of eachother, this being permitted b 'the flexibility of bar 5 which has been hardened and tempered to s ring tem er, having obtained its proper orm b t e slot therein, with the result that the ole within which the heads have been disposed may be properly gauged. `When the handle is rotated in a reverse direction, the wedge head 9 will be moved outwardly so that the heads 8-8 will 'move together in an obvious' manner. While I have shown spherical shaped heads' as associated with the tool, I may employ rectangular or any other shaped heads.

It will thus be seen that I have provided a highly novel, simple, and eiiicient micrometer expansion gauge, that is well adapted for all the pur oses heretofore designated, even though I ave herein shown and described the invention as consisting of certain detail structural elements, it is nevertheless to be understood that minor changes may be made therein without affecting the spirit and scope of the appended claim.

Having thus escribed the' what I claim is In an expansion gauge of the class described, an elongated hollow bar formed at one end with ahandle, said hollow bar being split longitudinally lfrom the handle portion to the other end thereof to provide a pair of spaced legs, head sections on the ends of the legs remote from the handle for enga ement within a hole to be gauged, a soc et formed on the end of the handle remote from the spaced legs, an elongated rod extending longitudinally through the hollow bar, the ends of the elongated rod being invention,

. threaded, a wedge threaded on one end of the rod for disposition between the head sections, said head sections having their inner' opposed `faces cut out to receive the wedge, a turning handle formed with a reduced neck for disposition in the socket,` the end of vent rotation of the wed e, said socket the neck portion being provided with a. member and the reduced nec of the turning 10 threaded opening to receive the other handle bein provided with cooperating inthreaded end of the rod whereby the rod dicating in icia. y

5 will be actuated to move the wedge member In testimony whereof I aix my signa.-

when the turning handle is rotated, a pin ture. projecting laterally from the wedge for disposltion between the head sections to pre- GUSTAV A. EISELE. 

